/* SQUIB - Scala's Quirky User Interface Builder 
    Copyright (C) 2008 Tim Dalton

    This library is free software; you can redistribute it and/or
    modify it under the terms of the GNU Lesser General Public
    License as published by the Free Software Foundation; either
    version 2.1 of the License, or (at your option) any later version.

    This library is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
    Lesser General Public License for more details.

    You should have received a copy of the GNU Lesser General Public
    License along with this library; if not, write to the Free Software
    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 
*/
    
/**
 * Trait to be used for component that fire ActionEvents as evidence by the existence of
 * an the addActionListener(ActionListener) method
*/
import scala.collection.mutable.HashMap 
    
package tfd.scala.squib {

    import java.awt.Component
    import java.awt.event.{ItemEvent, ItemListener}
    import java.util.EventObject
    import javax.swing.{AbstractButton}

    // Since descendents of AbstractButton and JTextField have addActionListener method but not from
    // an common ancestor or interface, we'll have to resort to structural typing
    trait FiresItemEvents[T <: {  def addItemListener(il:ItemListener) }] { self:FiresEventObjects with IdableTrait =>

        self.eventHandlers += (itemEvents _).asInstanceOf[(Object, HashMap[String, EventObject => Unit]) => Unit]

        def itemEvents(comp: T, events:HashMap[String, EventObject => Unit]):T = {
            val delegate = events.get("itemstatechanged")
            if (!delegate.isEmpty) {
                comp.addItemListener(new DelegateItemHandler(delegate.get))
            }
            comp
        }

        class DelegateItemHandler(delegate: ItemEvent => Unit) extends ItemListener {
            override def itemStateChanged(ie: ItemEvent) {
                delegate(ie)
            }
        }
    }
}